某地埋管地源热泵项目现场群孔热响应试验与分析

ANALYSIS OF GROUP BORE THERMAL RESPONSE TEST OF GROUND SOURCE HEAT PUMP PROJECT

介绍GP-3群孔岩土热响应试验仪原理和试验方法,并对实例项目进行2组(每组4个孔)群孔热响应试验。群孔中单孔岩土热物性参数与这些参数的各孔平均值相比,相对偏差最大达13.71%,而群孔(作为整体)岩土热物性参数与各单孔平均值相比,最大偏差仅2.71%。因此,场地岩土热响应试验孔数量布置太少时地埋管地源热泵系统设计风险较大。对于热响应试验孔数量较多的大型项目群孔热响应试验可提高试验效率。对于小型项目,群孔热响应试验在略增加试验成本(试验工期不变,增大加热功率)的基础上,可大幅提高试验成果的可靠性。

The principle and test method of group bore thermal response tester GP-3 are introduced,and two groups(4 bores in each group)group bore thermal response tests are carried out for the example project.The relative deviations of the thermal physical parameters for individual bore in the group bores is up to 13.71%compared with the average values of these parameters of each bore in the group,while the maximum ones for group bores(as a whole)is only 2.71%.Therefore,the design risk of ground source heat pump system is great when the number of test bores is too small.For large-scale projects with large number of test bores,the test efficiency can be improved with group bore thermal response test,while for small projects,it can greatly improve the reliability of the test results on the basis of slightly increasing the test cost(same test period,greater heating power).